A farm cooperative has asked you to design an experiment tha

A farm cooperative has asked you to design an experiment that measures the
effects of light exposure on the growth of tulips in the Skagit Valley of
Washington State. You hypothesize that tulips exposed to more direct light will
grow at a faster rate than those exposed to less light. You also wonder whether
the effects of light exposure persist when you control for the amount of
moisture the plants receive. You want to create a randomized comparative
design that considers three factors with the following levels:

Light Exposure (No, Yes)
Amount of Light Exposure (3 hours a day, 6 hours a day, 9 hours a day)
Amount of Moisture Exposure (1 hour a day, 3 hours a day, 5 hours a day)
You have 1,000 seedling plants at 12 different nurseries to use in your
experiment. Your experiment should run six months in length. Outline the
details of your experiment.

In your answer you should comment on a strategy for randomization, identify
all the possible treatment groups, and discuss what might be a possible
response variable. In addition, you should identify a couple confounding
variables and discuss a method of controlling for one of these variables. As
much as possible, use diagrams instead of words to summarize your
experimental design.

Solution

Group 1= Light Exposure Yes, Light for 3 hours, Moisture for 1hour/day
Group 2=Light Exposure No, Light for 3 hours, Moisture for 1hour/day
Group 3=Light Exposure Yes, Light for 6 hours, Moisture for 1hour/day
Group 4=Light Exposure No, Light for 6 hours, Moisture for 1hour/day
Group 5=Light Exposure Yes, Light for 9 hours, Moisture for 1hour/day
Group 6=Light Exposure No, Light for 9 hours, Moisture for 1hour/day
Group 7=Light Exposure Yes, Light for 3 hours, Moisture for 3hour/day
Group 8=Light Exposure No, Light for 3 hours, Moisture for 3hour/day
Group 9=Light Exposure Yes, Light for 6 hours, Moisture for 3hour/day
Group 10=Light Exposure No, Light for 6 hours, Moisture for 3hour/day
Group 11=Light Exposure Yes, Light for 9 hours, Moisture for 3hour/day
Group 12=Light Exposure No, Light for 9 hours, Moisture for 3hour/day
Group 13= Light Exposure Yes, Light for 3 hours, Moisture for 5hour/day
Group 14=Light Exposure No, Light for 3 hours, Moisture for 5hour/day
Group 15=Light Exposure Yes, Light for 6 hours, Moisture for 5hour/day
Group 16=Light Exposure No, Light for 6 hours, Moisture for 5hour/day
Group 17=Light Exposure Yes, Light for 9 hours, Moisture for 5hour/day
Group 18=Light Exposure No, Light for 9 hours, Moisture for 5hour/day

Different nuseries is a confounding variable they should all be at the same one.